This research paper, just published in PLOS One, by researchers at UC San Diego looked at Facebook status update data between January 2009 and March 2012 to determine whether status updates by users had a discernible affect on the emotions of their friends who were not in the same city as them. There's some pretty high end math in the paper, but putting that aside they showed that rainfall directly influenced the emotional content of the status messages of individuals and that this in turn affected the emotional content of the status messages of their friends in other cities not experiencing rainfall. The researchers used the Linguistic Inquiry and Word Count (LIWC) software to assess the positivity and negativity of messages posted.
This is fascinating stuff, and shows that we don't have to be in the same physical location as someone to potentially influence how they feel (or indeed be influenced by how they feel). The question arises whether this affect through a digital social network is confined just to emotion or whether, like in physical social networks, it also extends to influencing others' actions and choices?
As many of us spend increasing proportions of our waking hours communicating by digital means, and possibly less time than we used to in face-to-face interactions, this is certainly an area that warrants further investigation. In addition it bodes well for digital social networks as a catalyst for positive health behavior change in society.
As an addendum, when I run this blog post through the free version of the LIWC software I get a count of 1.27 positive emotions to 0.51 negative emotions. So all in all pretty happy!
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